NUOLUX 100PCS PP Greenhouse Gardening Plant Ring Hanging Collar Tag Label (Green) Color: Green. Material: PP. Size: 11* 2.4cm. Easy to hang on a tree and easy to take down. These tags are unaffected by weather(bright sun, high heat) and are working great to lable the multiple rows in your botanical garden. Can be used to lable the tree brance whose diameter is no more than 0.79". Can be used in greenhouse and any other gardening places.